Double acting internal combustion engine



Oct. 6, 1931. v v. o. LACAMBRA 1,825,961

DQUBLE ACTING INTERNAL COMBUSTON ENGINE Filed June 27. 1929 Patented Get. 6, 1931 UNITED STATES PATENT ori-ica VICENTE ORTELLS LACAMBRA, BARCELONA, SPAN DOUBLE ACTING INTERNAL CMBUSTON ENGvNE Application filed .Tune 27, 1929, Serial No. 374,109, and in Spain January 4, 1929.

This invention relates to a new internal combustion engine, characterized by the feature thatit is double acting on account of the fact that each cylinder of the engine comprises a combustion chamber for Veach one of the opposite sides of the corresponding piston in which the explosions of the fuel employed are produced alternately. c

One of the advantages of the engine accor( ing to the invention is the reduction in space occupied by the latter in comparison with existing engines since each cylinder of this engine performs the function of four independent cylinders.

lIn fact, by considering one side. only of the two sides of the piston, thev operation of the engine is on a two-stroke cycle, that is to say one explosion is obtained for each revolution of the crank shaft, but as the operation takes place on each side of the piston alternately, an explosion is obtained for each half revolution, one at the top and the other at the bottom of the stroke so that this engine, in comparison with existing four-stroke engines, may be considered as a single stroke engine and consequently each cylinder performs the work of four independent cylinders.

The engine is also characterized by the manner in which the explosive mixture is injected into the explosion chambers by means of a pump body which forms part of the corresponding cylinder so that apart from the m'echanical simplification which this arrangement provides, it presents the advantage of securing in an absolute manner a constant and perfect operation in synchronism with that of the corresponding piston.

An embodiment of the engine according to the invention will be described hereinafter and is illustrated diagrammatically in the accompanying dra-wings.

Figure 1 is a vertical section through a single cylinder engine of the kind indicated, provided with air cooled fins.

Figures 2 and 3 are details to a larger scale of one of the valves employed in the engine.

The engine shown comprises a body 1 which forms the cylinder, the lower part of which is extended to form the support and body 5 .through which-runs a piston 6 rigid with the rod 7 which passes through the cylinder 1- kand upon which is also mounted the piston 8, and this rod 7 is pivotally connected to the coi'inecting rod 4l'.

he piston 8 is provided on both vsides with the detlectors 9 which are placed opposite each 'other as also are the inlet and outlet ports in the cylinder 1 itself, which is provided at its ends with metal stuffing boxes 7.

'l` he cylinder 1 comprises at its central portion two inlet ports lland 11 and two outletports 12 and 12 arranged in such a way that the piston 8 in any one of the two extreme positions which it can occupy uncovers one inlet port and one outlet port and closes the other two.

The outlet ports 12 and 12 communicate with the exhaust pipe 13 and the inlet ports 11 andll withthe pump body 5 so that the port 11, correspondingto they upper combus tion chamber of the cylinder 1 leads into the lower part of, the pump body and the'porty 11', which corresponds to the lower chainber, leads ,into the upper part of the said pump body 5. The sparking plugs are situated at 14.

The pump body 5 is provided in addition to the two outlets 15an'd'15 corresponding to the inlet ports 11 and 11 of the cylinder 1 with inlets 16 into which lead the supply ducts from the carburetor and body, these inlets and the outlets 15 are provided with ball valves which are shown in detail in Figures 2 and 3.

Each of the said valves comprises three juxtaposed parts 17, 18 and 19 of which the end portions 17 and 19 comprise a circular aperture 20 which widens internally into a frusto conical seating 21 and upon one'of which bears the ball 22 which is pressed on its seating by the action of a spring 23. Moreover the ball 22 is guided in a circular aperture 24: formed in the intermediate member 18 and in which are formed grooves 25 by 'means of which a communication is established between the frusto conical surfaces 21 of the parts 17 and 19. In this Inanner the ball is at all times perfectly guided and a communication is duly established between the inlet and outlet of the said valve when the ball becomes separated from its seating.

Finally the engine described is cooled by means of the fins 26 which are provided on the czfylinder body 1 but the cooling may also be e ected by circulating Water or air under pressure or in any other convenient manner.

In the practical embodiment of the engine according to the invention the dimensions and shapes of accessory ports and the power and the number of cylinders which the engine comprises may be varied. The accessnry or complementary parts of the engine, the method of lubrication adopted .and the use to which the engine is put may also be varied, and in lgeneral all modifications may be made which do not alter or modify the essential `features of the invention.

What I claim is:

A double-action two-stroke cycle internal combustion engine comprising a working cylinder a double-acting piston for the cylinder, a double-acting pump cylinder for the Working cylinder, a piston in the pump cylinder, a piston rod connecting said pump piston to its adjacent Working cylinder piston, a crankshaft, a connecting rod, and a piston rod for the working piston connecting the working piston to the crankshaft on the side opposite the pump cylinder, so that the working cylinder is situated between `the pump cylinder and the crankshaft, gas-tight glands at either end of the Working cylinder through which pass the piston rods coupling the working piston to its pump piston above and connecting rod below, ducts leading from each end of the pump cylinder to the working cylinder, ducts leading from a `carburetor to each end of the pump cylinder and non-return valves in each of said ducts.

In tcstilnony whereof I have signed my name to this specification.

VICENTE ORTELLS LACAMBRA. 

